Recently ive just installed the complete OME lift kit...883 in front with 90004 shocks and 891 in rear with sport shocks. Install went well test drove went fine. Had an alignment that seemed fine. No diff drop or panhard drop bracket yet. Are these neccessary? However now when i reach 90kmh/55mph and over i get a noticeable vibration throughout the whole truck. Not sure where its coming from but it seems even throughout the whole truck. Perhaps from the tires....tires are brand new and recently balanced with 5000kms or less.....or perhaps the alignment job? Its seems like this happened after the alignment job but I could be wrong. Has this happened before to anyone else? Any suggestions?